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Acta Paediatrica > 101 > 4 > e156 - e162
Preventive Medicine > 2008 > 47 > 1 > 107-111
Preventive Medicine > 2007 > 44 > 5 > 416-420
Acta Paediatrica > 101 > 4 > e156 - e162
Preventive Medicine > 2008 > 47 > 1 > 107-111
Preventive Medicine > 2007 > 44 > 5 > 416-420